Basically it seems the pilot got badly disoriented while manoevering to get on to the ILS on a black night approach into Alice Springs.
Have another read of the report and pay attention to the time of the approach.
The pilot got himself all out of shape and was lucky to get away with it. Low TT and low IF experience is a risky combination in single pilot piston engine ops. With all the posts about trying to get work in the top end it seems unusual that someone was given a job flying 310s with 320 hours and a brand new CPL MECIR. My recommendation to any low time IFR pilot in that part of the world is to hand fly and practise instrument approaches "eyes down" as often as possible. The operator's solution is to mandate the use of the autopilot. My question would be how well is the auto pilot maintained if the AH wasn't up to specs?
The pilot is lucky he didn't join the Westwind, hopefully he has learnt a valuable lesson.